What was found
DURING CLIMB, THE HYDRAULIC FLUID IN THE NR 1 HYDRAULIC SYSTEM DECREASED. AIRCRAFT RETURNED TO NRT AND LANDED WITHOUT INCIDENT. REPLACED THE PRESSURE TUBE ON THE PRESSURE MODULE. OPERATIONAL CHECK GOOD.
- Difficulty date
- December 20, 1996
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N639US
- Make and model
- Boeing 747251F
- Aircraft serial
- 23887
- System (JASC)
- 2910 · Hydraulic System, Main
- Part
- Pressure Tube
- Condition
- Leaking
- Location
- Nr 1 Hyd Sys
- Stage of operation
- CL
- Nature of condition
- K, J
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.